Under isothermal condition, a gas at 300 K expands from 0.1 L to 0.25 L against a constant external pressure of 2 bar The work done by the gas is: [Given that 1Lbar= 100J)

Question

Under isothermal condition, a gas at 300 K expands from 0.1 L to 0.25 L against a constant external pressure of 2 bar The work done by the gas is: [Given that 1Lbar= 100J) (A) 25 J (B) 30 J (C) - 30J (D) 5 kJ

Tardigrade Admin · Accepted Answer

∴ Wirr = - Pext Δ V = - 2 bar × (0.25 - 0.1) L = - 2 × 0.15 L-bar = - 0.30 L-bar = - 0.30 × 100 J = - 30 J

Q. Under isothermal condition, a gas at 300 K expands from 0.1 L to 0.25 L against a constant external pressure of 2 bar The work done by the gas is : [Given that 1Lbar= 100J)

25 J

30 J

- 30J

5 kJ

$∴ W_{i rr} = - P_{e x t} Δ V$
= - 2 bar $\times$ (0.25 - 0.1) L
= - 2 $\times$ 0.15 L-bar
= - 0.30 L-bar
= - 0.30 $\times$ 100 J
= - 30 J

Q. Under isothermal condition, a gas at 300 K expands from 0.1 L to 0.25 L against a constant external pressure of 2 bar The work done by the gas is : [Given that 1Lbar= 100J)

25 J

30 J

- 30J

5 kJ

∴Wirr​=−Pext​ΔV = - 2 bar × (0.25 - 0.1) L = - 2 × 0.15 L-bar = - 0.30 L-bar = - 0.30 × 100 J = - 30 J

$∴ W_{i rr} = - P_{e x t} Δ V$
= - 2 bar $\times$ (0.25 - 0.1) L
= - 2 $\times$ 0.15 L-bar
= - 0.30 L-bar
= - 0.30 $\times$ 100 J
= - 30 J